Driver for driving thin-walled dowels into railway sleepers



' Feb. 22,1927. 1,618,889

M. RUPING omvnn won muvme THIN WALLED DOWELS mwo RAILWAY SLEEPERS Filed Nov. 25. 1924 Patented Feb. 22, 1927.

UNITED STATE MAX DRIVER FOR DRIVI norms, or MUNICH, GERMANY, assreivoa'ro DUBELWEBKE e. M. 3. 11., or BERLIN, GERMANY.

NG'rHIN-waLLnn :oowELs INTO RAILWAY sLEErERs.

Application filed November 25, 1924, Serial No. 752,223, and in Germany January 25, 1924.

This invention relates to a driver defor driving thinwalled dowels into signed railway sleepers or ties. In a certain type or 5 rails are supported tioned tached on transver railway tracks the sely posisleepers or ties to which they are atby means of screws and base plates.

threaded engagement head of the screw serving on the screws base plate. I become loosened in the ties of vibrations caused by the train track and this applies particularly to ,in the track. The screws finally be- .011 the curves come so loose that they and it ties n to rein Since a screw of the attaching the rails cannot be s solid wood,

bored provid preliminarily bo is in order to be able use that it has long force or ii but requires a hole whose dlameter dowels.

veniently bored after .the inserti plugs as this would not ensure the bored are the plugs accessib Heretofore dowels sary to boring.

rial as number of at the exact center of the in the holes.

widen This requires much time ties which years have holes filled ranged in with the wood tie, the to anchor the rail After a certain time the acteristic features and scope of the inventlon by reason traveling are easily pulled out to maintain such been the practice ll the widened holes.

dimensions used, for crewed in the preliminarily is smaller than the blocks or in Geron of the hole being dowel nor 1e along the track.

with relatively strong walls have been used in filling the widened 7 must be hammer-ed in or else been provided with threads In order to drive dowels in the holes it is necesthe holes in the ties by further and matehave been in service for a with sand and the like, soon dulling the drill and reguiring re-sharpening importance to wider walled out a special auxiliary the hole of the tie wo It is the primary aim an thereof. It avoid having to dril is thus of l the holes in the ties and to make use of thindowels which, however,

if used withmeans, when driven in uld be injured.

d object of this invention therefore to provlde a driver for driving thinwalle ties, adapte d dowels into the holes of the driver having a mandrel which is ore of the of the thin-walled will be more readily apparent from the following description taken in connection with the accompanying drawings and pointed out in the claims forming a part of the specification.

The invention is clearly illustrated in the accompanying drawings, in which the figure is an elevational'view partly in section showing the improved driver with a dowel on the mandrel thereof at the time the dowel is finally anchored in the tie.

Referring now, more particularly, to the accompanying drawings the driver is composed of two parts, namely, a top part a reduced to provide a shoulder and a depending mandrel i the latter being provided in turn with abutting surfaces in the form .of

adapted to engage the spiral teeth which are inner bore of the dowel 76. It is tobe noted that these abutting surfaces, which considering a single radial plane are spaced longltudinally on said mandrel. The top part a is receivable within a socket b in the driven member 0, a bolt cl acting to connect the top parta to the driven member 0 thebolt being detachably held in position by means of a cotter f. A rod m inserted through the transverse bore in the driven member 0 serves as a handle for the driver.

The most importantelement of the tool is the mandrel i which is inserted in the bore dowel for preventing its injury or collapse on being which operation the annular front surface of the member a projecting laterally from the mandrel when struck transmits the blow to the front surface of the dowel while the mandrel i placed in the bore of the dowel 7a prevents injury thereto. It has been shown that with the the dowel will still be injured in being driven in because the pressure or force exdriven in during use of a smooth mandrel i g erted on the upper part or end of the dowel through the top part a is too great and could not be withstood by the thin wood walls. However when a threaded end is provided for the mandrel as shown in the drawing having downwardly directed relatively large front end surfaces, the dowel is never damaged.

The effect of the thread is that on driving in the lower end of the dowel the wood is compressed inwardly and is thereby forced into the threads of the mandrel The lower end is driven in with relative ease as the adhesion of this short end to the walls of the hole is relatively slight by reason of the shortness of this end.

As soon as the thread i engages in the wood of the dowel the further insertion of the dowel takes place not only through the action of the force exerted by the end surface of the top part a on the upper front or end surface of the dowel but also simultaneously through the effect of the thread which now draws the lower end of the dowel into the hole or in other words the impact of the blows is no longer transmitted only to the upper front end of the dowel, but through the end of the screw thread on the wood of the lower dowel portion at the same time. Inasmuch as the result of this action the impact force is distributed over a larger surface and the largest part of this surface is at the lower end of the dowel, which is protected from injury by the walls of the hole in the tie, any damage is completely precluded by the use of the new tool.

It is repeated that by reason of the use of the new tool, the dowel may be made with extremely thin walls and as a result it is not necessarw to enlarge the widened holes in the ties before driving in the dowel, thus saving labor.

After the dowel has been driven in by means of the mandrel, the top part or member a is rotated and therewith the mandrel i which is carried with the latter. In this retation the steep pitch of the thread of the mandrel engaged in the wood of the dowel screws the mandrel out of the dowel so that the mandrel is released from the dowel wood after a few turns and the member or top part a, drawn out upwardly.

After the mandrel has been withdrawn from the dowel and the screw bolt by means of which the rails are fastened on the tie is again screwed in the tie, that is in the hole of the dowel as the dowel is inserted in the hole of the tie for the reception and retention of the screw bolt.

Another point to be noted is that the base plate which is inserted between the rail foot 0 and the tie a is generally maintained by three screws. In other dowelling methods the base plate in order to permit dowelling must be removed from its position. in order to make the hole in the tie accessible therefor. If at the point of attachment only one of the three screw bolts has become loosened, the other two which pass through the same plate must be loosened or removed; when again screwed in they never have the same solid retention in the wood and they also must be dowelled thus an increased expense of labor and material.

With the use of the new tool this defect can be eliminated when the lower part a is made so thin as to pass through the hole in the plate 9 and the dowel 70 made so thin that it can be passed through the hole in the plate g. Then, when one of the screws become loosened the other may be left in place and also the plate left in place, the dowelling being done through the hole in the plate. In this connection itis to be understood that the plate is by no means nailed fast to the tie by means of the dowel but the latter penetrates entirely through the plate. After driving in the dowel no part thereof is in the hole of the plate; the dowel serving solely for the reception of the screw bolt the head of which forces the foot 0 of the rail against the plate 9 and the latter is forced against the tie a.

Even when all of the screw bolts of one plate become loose the dowelling can be done without removing the plate, which isan important advantage because, as long as the plates are in position below the rails the train can travel on the track without danger as the rails are still supported by other ties; however, if the plate is removed the rails are likely to bend to a great degree and accidents may occur. The dowelling operation can thus be carried out without interrupting the operation of trains over the track.

It is believed in view of the foregoing that a further detailed description of the operation of the invention is entirely unnecessary. Likewise it is believed that the advantages of the invention will be readily apparent.

Having thus fully described the invention what is claimed as new and'desired to be secured by Letters Patent is l. A driver designed for the driving in of thin-walled dowels into railway sleepers comprising a top part, a reduced mandrel depending from the top part and forming a shoulder, and abutting Surfaces which, considering a single radial plane, are spaced longitudinally on said mandrel.

2. A driver for driving thin-walled wooden dowels comprising an enlarged top part and a reduced mandrel, thereby providing a shoulder at the junction with the top part, and the mandrel having a high pitched thread cut therein.

3. A driver for driving thin-walled wooden dowels comprising an enlarged top part and a reduced mandrel, thereby prowith the upper edge of the dowel during the 15 viding a shoulder at the junction with the driving operation. top part, and the mandrel having a high 5. A driver in accordance with claim 2, pitched thread cut in the lower portion wherein the deep pitched thread is multiple thereof. so that notwithstanding the deepness of the 4. A driver for driving thin-Walled pitch the threads lie close to each other. 20 wooden dowels, including an enlarged top 6. A driver in accordance with claim 2, part, a reduced mandrel depending from wherein the lower flank of the thread is versaid top part and forming a shoulder at the tical and the upper flank oblique with rejuncture with the top part, abutting Surfaces spect to the axis of the mandrel. which, considering a single radial plane, are In testimony whereof I have signed my 25 spaced longitudinally on said mandrel, and name to this-specification. the top part of the driver having a diameter such that the shoulder will always contact MAX RUPING. 

